Rear end gearing

[corky]

What's the best way to determine or find out what gearing I have, it's an 03 ltz with a towing package if that helps at all,

 

[Matt]

Look in the glovebox for the RPO codes.

G80 Differential, locking, heavy-duty, rear
GT4 Rear axle, 3.73 ratio
GT5 Rear axle, 4.10 ratio
GU6 Rear axle, 3.42 ratio

 

[corky]

Look in the glovebox for the RPO codes.

G80 Differential, locking, heavy-duty, rear
GT4 Rear axle, 3.73 ratio
GT5 Rear axle, 4.10 ratio
GU6 Rear axle, 3.42 ratio

Thank you

 

[corky]

Thank it looks like I have the g80 and gt4